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The BMP180 is a digital barometric pressure sensor designed for altitude measurement, weather monitoring, and indoor navigation. It uses a piezo-resistive sensing element and provides digital output via I2C or SPI. With high accuracy and low power consumption, it is ideal for IoT applications, drones, and GPS systems. The sensor measures absolute pressure, which can be converted to altitude using calibration formulas. It is widely used in meteorology, environmental monitoring, and flight control systems.